package com.heima.app.gateway.filter;

import com.heima.app.gateway.util.AppJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
@Slf4j
public class AuthorizeFilter implements Ordered,GlobalFilter{
    /**
     * 优先级设置，值越小，优先级越高
     * @return
     */
    @Override
    public int getOrder() {
        return 0;
    }

    /**
     *
     * @param exchange
     * @param chain
     * @return
     */
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1获取request和respond
        ServerHttpResponse response = exchange.getResponse();
        ServerHttpRequest request = exchange.getRequest();
        System.out.println("test "+request.getURI());
        //2判断是否登录
        if(request.getURI().getPath().contains("/login")){
            //要登登录则放行
            return chain.filter(exchange);
        }

        //3获取token
        String token = request.getHeaders().getFirst("token");

        //4判断token是否存在
        if(StringUtils.isBlank(token)){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //5判断token是否有效
        try {
            Claims claimsBody = AppJwtUtil.getClaimsBody(token);
            //5.1是否过期
            int result = AppJwtUtil.verifyToken(claimsBody);
            if (result == 1 || result == 2) {
                //过期
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }
            //获取用户信息
            Object userId = claimsBody.get("id");
            //存储在header中
            ServerHttpRequest serverHttpRequest=request.mutate().headers(httpHeaders -> {
                httpHeaders.add("userId",userId+"");
            }).build();

            //重置请求
            exchange.mutate().request(serverHttpRequest);
        }catch (Exception e){
            e.printStackTrace();
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
            //6放行
        return chain.filter(exchange);
    }
}
